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Hacksaw · 12-18-2016, 01:59 PM

That screw head was designed by a Canadian named Robertson somewhere in the 1950's. Four sizes matched to a colour. Smallest being yellow, then green, red and black. Never got popular in the States but they really work well, stay on the end of your driver bit and don't strip easily.

12-18-2016, 01:59 PM	#7
Hacksaw Senior Member Join Date: Sep 2016 Posts: 884 Likes: 208 Liked 311 Times in 175 Posts	Re: classic dominator siding screws That screw head was designed by a Canadian named Robertson somewhere in the 1950's. Four sizes matched to a colour. Smallest being yellow, then green, red and black. Never got popular in the States but they really work well, stay on the end of your driver bit and don't strip easily.